diff --git a/Backend/nix/osrm.nix b/Backend/nix/osrm.nix
index 94b398c4dde..34d4716b922 100644
--- a/Backend/nix/osrm.nix
+++ b/Backend/nix/osrm.nix
@@ -3,7 +3,7 @@
 let
   openStreetDataFile = inputs.osrm-pbf;
   # NOTE: This *should* match the flake input.
-  openStreetDataFileName = "southern-zone-231222";
+  openStreetDataFileName = "southern-zone-230101";
 in
 {
   perSystem = { pkgs, lib, ... }: {
diff --git a/flake.lock b/flake.lock
index cf25d2b3983..31ebed2e884 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2492,13 +2492,13 @@
     "osrm-pbf": {
       "flake": false,
       "locked": {
-        "narHash": "sha256-5bOv6M/WFhOUMbR53hhyxjn5Hq0TvGJhAWksV4z0tz4=",
+        "narHash": "sha256-KEpT7YUG3UsaEM4V8vtWVmxU4Mz8gl0gyC6X07GVbao=",
         "type": "file",
-        "url": "https://download.geofabrik.de/asia/india/southern-zone-231222.osm.pbf"
+        "url": "https://download.geofabrik.de/asia/india/southern-zone-230101.osm.pbf"
       },
       "original": {
         "type": "file",
-        "url": "https://download.geofabrik.de/asia/india/southern-zone-231222.osm.pbf"
+        "url": "https://download.geofabrik.de/asia/india/southern-zone-230101.osm.pbf"
       }
     },
     "passetto": {
diff --git a/flake.nix b/flake.nix
index 2a6b6ec30c8..37a2ea696f2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -34,7 +34,7 @@
     # over time.  NOTE: This file is not permanent, find the available one at
     # https://download.geofabrik.de/asia/india/
     # NOTE: If you change this, also change `openStreetDataFileName` in osrm.nix
-    osrm-pbf.url = "https://download.geofabrik.de/asia/india/southern-zone-231222.osm.pbf";
+    osrm-pbf.url = "https://download.geofabrik.de/asia/india/southern-zone-230101.osm.pbf";
     osrm-pbf.flake = false;
 
     easy-purescript-nix.url = "github:justinwoo/easy-purescript-nix/a90bd941297497c83205f0a64f30c5188a2a4fda";